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L lingkaran = phi x r² = 3,14 x 10 x 10 = 314 cm²
L arsir = 400-314 = 86 cm²
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Luas Lingkaran = phi r^2
= 3,14 x 10^2
= 314 cm^2
Luas persegi = S x S
= 20x20
= 400 cm^2
Luas daerah arsir = Luas persegi - luas lingkaran
= 400 - 314
= 86 cm^2